Is there any way to quickly whiten my skin before the end of the year?

My face is sallow and dark compared to my neck, and it looks dull and lifeless. I'm concerned about this. I want to know how to whiten my skin. I have an important meeting at the end of the year and need to look good. I want to pay more attention to my skin before the meeting, but is there a way to whiten my skin quickly? I've looked into ways to whiten my skin, but self-care seems too much, and I think going to a dermatologist would be the fastest option. If I were to invest about two weeks in my skin, what kind of treatment would be good? Besides whitening, if there's any way to achieve optimal skin condition, please recommend it.